User Manual

Modulation Function 46
Function Explanation
Type ASK Amplitude shift keying modulation.
Source Internal The source is internal.
External The source is external. Use the [Aux In/Out] connector at the rear panel.
Key Freq Set the frequency at which the output amplitude shifts between the carrier amplitude and zero
(internal modulation only): 1mHz~1MHz.
Figure 9.6 Setting Interface of ASK Modulation
Note: The methods for setting the parameters of ASK are similar to AM. In addition, the external modulating signal
of ASK must be Square which complies with the CMOS level specication.
9.1.7.2 PSK
When using PSK (Phase Shift Keying), congure the generator to “shift” its output phase between two preset phase
values (carrier phase and modulating phase). The default modulating phase is 180°.
Press Mod → Type → PSK, the parameters of PSK modulation are shown in Figure 9.7.
Note: The methods of setting the parameters of PSK are similar to AM. In addition, the external modulating signal
of PSK must be Square which complies with the CMOS level specication.
9.1.7.3 PWM
For only the “Pulse” a PWM (Pulse Width Modulation) is available. The pulse width of the pulse varies with the voltage
of the modulating waveform. Especially when using an ARB waveform for modulation, a wide range of waveforms is
possible.
Press Waveforms → Pulse → Mod, the parameters of PWM modulation are shown in Figure 9.8.
9.1.8 Pulse Width/Duty Deviation
Width Deviation represents the variation of the modulated waveform pulse width relative to the original pulse width.
Press Width Dev to highlight the parameter, and use the numeric keyboard or arrow keys and knob to input the desired
value.
• The width deviation cannot exceed the current pulse width.
• The width deviation is limited by the minimum pulse width and current edge time setting.